Evaluation of Release Technology for Trichogralnma chilonis Ishii in the Management of Cotton Bollworms

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Authors

  • Department of Entomology, Punjab Agricultural University Ludhiana, 141 004, Punjab ,IN
  • Department of Entomology, Punjab Agricultural University Ludhiana, 141 004, Punjab ,IN
  • Department of Entomology, Punjab Agricultural University Ludhiana, 141 004, Punjab ,IN
  • Department of Entomology, Punjab Agricultural University Ludhiana, 141 004, Punjab ,IN

DOI:

https://doi.org/10.18311/jbc/2006/3912

Keywords:

Bollworms, Cotton, Release Technology, Trichogramma chillonis.

Abstract

Studies were carried out during 2003 and 2004 to find out the release technology of Trichogramma chilonis Ishii (weekly releases from July to October @ 1, 50, 000 ha) for the management of cotton bollworms. Releases as tricho-card (100, 150 and 200 points/ ha) were compared with adult releases. On the basis of incidencc of bollworms among fruiting bodies (17.63 and 16.79%), green bolls (26.87 and 14.14%), parasitization of Helicoverpa armigera (Hubner) eggs (17.41 and 19.64%) and seed cotton yield (8.24 and 9.26 q/ha). The releases as adult proved better. Releases at 200 points/ ha was better than releases at 100 and 150 points/ha.